JP2577383Y2 - Hermetic shield machine - Google Patents

Description

[Detailed description of the invention] The invention is based on roads, railways,
The present invention relates to a shield excavator used to construct an underground space such as a tunnel for an electric power / communication facility and an underground shopping mall, an underground parking lot, etc., and more particularly, to a muddy pressurized shield construction method for excavating a tunnel having a rectangular cross section. And improvement of a closed shield machine.

(Conventional technology) Conventionally, shield excavators for constructing underground spaces have
It was to excavate a tunnel with a circular cross section. However, there is a problem in that a tunnel having a circular cross section creates a useless space that is not used when actually used for a road, a subway, or the like.

Therefore, in order to eliminate the useless space of the tunnel having the circular cross section, to reduce the tunnel construction cost and shorten the construction period, a closed rectangular shield machine has been proposed.

For example, Japanese Patent Application No. 63-21819 already disclosed by the present applicant.
As shown in FIGS. 4 and 5, the shield machine of No. 4 has a rectangular tunnel excavator body 1 supported at the tip of a lining 11 so as to be directionally controllable. A jack 1a for controlling the direction, a pair of drum cutters 2 arranged coaxially with a rotation axis in a direction perpendicular to the excavation direction at a tip end of the tunnel excavator main body 1 at a predetermined interval, and a pair of drum cutters 2 And a pair of ring cutters 3 capable of digging the same diameter as the digging diameter of the drum cutter 2, and implanted on the entire peripheral surface of the drum cutter 2 and the ring cutter 3. Cutter bit
10 and a rotary drive source 4 arranged in the tunnel excavator body 1
And a rotary drive source 4 passing through a space provided in the tunnel excavator body 1 and formed on the opposing surfaces of the pair of drum cutters 2.
A power transmission mechanism 7 for transmitting power from the motor, a speed reduction mechanism 12 interposed between the power transmission mechanism 7 and the rotary drive source 4,
Soil discharging means 8a provided behind the ring cutter 3 or the drum cutter 2 and mud sending means 8a for sending muddy water to the chamber.
And a structure having:

The shield excavator 9 formed in this manner enables a tunnel having a rectangular cross section to be excavated even in a sealed mechanical shield construction method.

(Problems to be Solved by the Invention) However, in the above-mentioned sealed mechanical shield method having a rectangular cross section, it can be applied to a muddy pressure shield method or a mud pressure shield method, but the cross-sectional shape of the shield excavator is limited. Due to the rectangular shape, there is a drawback that the excavated earth and sand are more likely to stay or adhere to the bottom, particularly in the bottom surface in the chamber, as compared with the case of the circular cross section.

The present invention has been made in view of the above-mentioned problem, and also in a shield construction method having a rectangular cross section, sediment scraping that prevents stagnation of excavated sediment near the discharging means in a chamber and suppresses adhesion of excavated sediment. It is an object of the present invention to provide a sealed shield machine provided with means.

(Means for Solving the Problems) The gist of the present invention for achieving the above object of the hermetically sealed shield machine according to the present invention and solving the problems is to have a partition wall forming a closed space between the face and the face, A cutter for excavating a face is provided in the enclosed space, a drive source for rotating and driving the cutter is provided on a rear side of the partition wall, a jack for excavation is provided, and mud discharging means for discharging excavated earth and sand is provided. In the hermetic shield excavator for excavating a tunnel having a rectangular cross-section, which is provided on the partition wall with its mouth facing the inside of the chamber, the shape of a `` C '' having a central bearing provided in the vicinity of the mud hole as a top is described. A pair of screws formed and disposed in the chamber, for conveying muddy water in the chamber containing the excavated earth and sand into the discharge port, and enclosing the lower part of the pair of screws in a semicircle, A bottom plate inclined and bridged over the partition wall from the bottom surface toward the lower part of the mud hole, and a pair of screws disposed to be separated from the chamber by the bottom plate and rotating the pair of screws, respectively. And a drive source and a power transmission device. Further, a chamfered plate is provided at a corner portion in the chamber to prevent stagnation and adhesion of excavated earth and sand.

(Operation) As described above, according to the closed shield excavator according to the present invention, the excavated sediment scraping means is disposed toward the mud hole of the soil discharging means provided at the lower part of the partition wall. Excavated earth and sand contained in the muddy water inside is efficiently transported to the mud outlet. In addition, since the chamfered plate is provided at the corner of the chamber, the excavated earth and sand are prevented from staying and adhering to the bottom, and a smooth excavation operation is ensured.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a shield machine according to an embodiment of the present invention.
13 is a cross-sectional view showing a main part of the thirteen main body 1, and FIGS. 2 and 3 are an enlarged cross-sectional view and an enlarged plan view thereof. The parts corresponding to those in the conventional example are denoted by the same reference numerals.

The hermetic shield machine 13 has a partition wall 5 that forms a closed space (hereinafter referred to as a chamber) 14 between itself and a face of a tunnel, and a cutter (drum cutter) for excavating a face in the chamber 14. 2 and a ring cutter 3), a drive source 4 for driving the cutter for excavation and rotation is provided on the rear side of the bulkhead 5, and a jack 1a for excavation and direction control is provided for discharging the excavated earth and sand. The discharge port 16 of the discharge pipe 15 is provided on the partition wall 5 so as to face the inside of the chamber 14 and is formed.

The bottom plate 17 in the chamber 14 is provided with a sediment scraping means 19 comprising a screw 18 for conveying the excavated earth and sand into the sludge outlet 16 of the sludge pipe 15.

The screw 18 is composed of a pair of screws 27 and 28, each rotating shaft 20 of which is mounted on a side wall of the sealed shield machine 13 as shown in FIG. 2 and is shown in FIG. As described above, the screws 27, 2 whose feeding directions are opposite to each other
8 are provided on the rotating shaft 20 so as to face each other.

That is, the central bearing 26 is provided in the chamber 14, the axes of the rotating shafts 20, 20 of the screws 27, 28 are inclined so as to form two sides of a triangle having the central bearing 26 as an apex, and
Set along the inclined bottom plate 17 and screw
The shafts 27 and 28 are mounted via the central bearing 26.

A bevel gear 29 provided at the tip of a drive shaft 24, which is a power transmission device coaxially connected to the drive shaft of the motor 23,
The bevel gear 21 provided at the end of each rotation shaft 20 of the screws 27 and 28 is rotated.

With this configuration, the excavated sediment contained in the muddy water in the chamber 14 is moved from the side wall of the chamber to the center by the component force given by the rotation of the screws 27 and 28, and also in the direction of the drainage pipe 15 It is moved, and the efficiency of excavation of excavated soil is improved.

As described above, the sealed shield excavator including the screw 18 formed in the shape of the “<” by the screws 27 and 28
Excavation action using 13 will be described.

As shown in FIG. 1, the cutting face of the tunnel is excavated through the power transmission mechanism 7 in the gear case 6 by activating the drum cutter 2 and the ring cutter 3 by operating the drive source 4, thereby excavating the excavated soil. Take in sequentially in 14.

At the same time, the mud pipe 25 provided above the partition 5
The mud is fed into the chamber 14 from above, and the excavated earth and sand are mixed with the mud to ensure fluidity.

Further, the screw 18 is rotated in synchronization with the two motors 23, and the rotary shaft 20 is rotated from the drive shaft 24 via the bevel gears 29 and 21 in the direction indicated by the arrow in FIG. Thereby, the muddy water in the chamber containing the excavated earth and sand is conveyed in the direction of the mud discharge port 16 of the mud discharge pipe 15.

Thereby, the muddy water containing the excavated sediment is discharged to the drainage pipe 15 while preventing the excavated sediment from remaining at the bottom of the chamber 14.
Suck it in with a pump, etc., and discharge it out of the tunnel.

The screw 18 is, as shown in FIG.
The excavated soil is rotated so as to flow, but of course, not only this, but also forward and reverse rotations are possible, whereby the excavated earth and sand can be agitated, and adhesion and stagnation thereof can be prevented.

In addition to the above embodiment, in order to prevent the accumulation of excavated earth and sand in the chamber 14, the four corners of the chamber 14 are formed as inclined surfaces by chamfering plates 30 (see FIG. 1) which are formed as much as possible without the corners. I have.

As described above, the sediment scraping means 19 of the hermetically sealed shield machine according to the present invention has been described, but when the tunnel has a large cross section and the sludge pipe 15 has a plurality of systems, the sediment formed by the screw is used. Of course, the scraping means 19 is of a large diameter, and the direction of the blade of the screw 18 is adjusted in several ways in accordance with the mud outlet.

(Effects of the Invention) As described above, the hermetic shield excavator according to the present invention has a partition wall that forms a hermetic space between the hermetic shield excavator and a face face, and a cutter for excavating a hermetic face is provided in the hermetically sealed space. A drive source for rotationally driving the cutter is provided on the rear side of the partition wall, a jack for excavation is provided, and a discharge port of a discharging means for discharging excavated earth and sand is provided on the partition wall facing the chamber. In a hermetically sealed shield machine for excavating a tunnel having a rectangular cross section, a central bearing provided near the mud hole is formed in a `` C '' shape having a vertex as a vertex and disposed in the chamber, A pair of screws for conveying muddy water in the chamber containing the excavated earth and sand into the mud outlet, and encircling the lower part of the pair of screws in a semicircle, from the bottom of the chamber toward the lower part of the mud outlet. Said Earth and sand scraping, comprising: a bottom plate inclined and bridged over the partition wall; and a pair of drive sources and a power transmission device that are disposed separated from the chamber by the bottom plate and rotate the pair of screws respectively. Since the means is provided, the muddy water in the chamber including the excavated sediment can be efficiently conveyed to the mud outlet while preventing the excavated sediment from adhering to and staying at the bottom of the chamber. Therefore, the excavation work can be made more efficient.

Furthermore, since the bottom plate is inclined to the partition wall toward the drain port and surrounds the lower part of the pair of screws in a semicircular shape, the height of the pair of screws in the vertical direction (vertical direction) is reduced. Since it can be held down, it is possible to provide a means for scraping earth and sand without changing the height from the bottom of the mud outlet and the mud pipe.

Further, by disposing a chamfered plate at a corner in the chamber, it is possible to prevent stagnation and adhesion of excavated earth and sand at the corner. Also, formed by tilting the bottom plate,
A power transmission device can be housed in a space formed between the bottom plate and the bottom surface of the partition wall, and a surrounding area for the power transmission device required when the power transmission device is disposed in the muddy water. A frame is not required, the structure is simple, and the flow of mud water including excavated earth and sand is not hindered.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a shield machine according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view thereof, FIG. 3 is a partially enlarged plan view of the shield machine, FIG. FIG. 5 to FIG. 5 are a front view and a plan view of a sealed shield machine according to a conventional example. DESCRIPTION OF SYMBOLS 1 ... Tunnel excavator main body, 1a ... Jack, 2 ... Drum cutter, 3 ... Ring cutter, 4 ... Rotation drive source, 5 ... Partition wall, 6 ... Gear case, 7 ... Power transmission mechanism, 8 ... discharging means, 8a ... mud feeding means, 9 ... shield machine, 10 ... cutter bit, 11 ... lining, 12 ...
… Deceleration mechanism, 13… Shield excavator, 14… Chamber, 15… Drainage pipe, 16… Drainage outlet, 17… Bottom plate of chamber, 18… Screw, 19 ,
20 ... rotating shaft, 21 ... bevel gear, 23 ... motor, 24 ... drive shaft, 25 ... mud pipe, 26 ... central bearing, 27, 28 ... screw, 29 ... bevel gear, 30 …… Chamfer board.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toru Taniguchi 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Masahiro Nakagawa 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Inside (72) Inventor Yuji Tatekawa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Makoto Ukegawa 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Taro Watanabe 4-25-3-203, Kamiogi, Suginami-ku, Tokyo

Claims (2)

(57) [Scope of request for utility model registration] 1. A partition having a rectangular shape forming a chamber which is a closed space between the face and a face, a cutter for excavating the face is provided in the chamber, and a driving source for rotating the cutter is provided by the partition. A seal for excavating a rectangular cross-section tunnel, which is provided on the bulkhead, provided with a jack for excavation, provided with a mud outlet of an excavating means for excavating excavated earth and sand facing the chamber, as well as provided on the rear side. In the type shield machine, the central bearing provided near the drain port is apex.
And a pair of screws arranged in the chamber and configured to convey the muddy water in the chamber containing the excavated earth and sand into the drain port, and encircling the lower part of the pair of screws in a semicircular shape. A bottom plate inclined and bridged over the partition wall from the bottom surface of the chamber toward a lower portion of the mud outlet, and the bottom plate is disposed to be separated from the chamber, and each of the pair of screws is rotationally driven. A sealed shield machine comprising: a pair of drive sources and a power transmission device; 2. The sealed shield machine according to claim 1, wherein a chamfered plate is provided at a corner of the chamber to prevent stagnation and adhesion of excavated earth and sand.